Sony A7 + Zeiss Sonnar 55mm F/1.8

The amount of detail this lens gives me is insane. 1:1 @ F/1.8 crop looks perfect and I've used this setup for professional gigs for quite some time now, of course always carrying 5D Mk III as a backup. There is no lens that can compete with the contrast the Sonnar gives, not in the Canon fast primes category at least.